Teach Pendant Login/UAS rapid instructions

Hello all, I am trying to figure out a way to auto log off a teach pendant after x amount of time. We have some operators that like to follow behind qualified techs and press things on a teach pendant after the tech forgets to log out of the teach pendant.

ABB has assured me this is not possible for whatever reason. The thing is though, our PLC is able to change recipes to the robot by logging in and out of the robot using what i believe is called "RAB" with full access admin writes. You can actually see the login and log out happen in the event log for the admin user. So I am not so sure I believe what they are telling me. 

My question then if it isn't possible, is there a way to read event codes with rapid instructions ? This way I can read which user is currently active and if the correct user is not logged in depending on the position of the key switch I can throw a fault of some kind or create a motor off condition. Or maybe is there a way to tie an output to a specific event code ? 

I am really trying to avoid stuffing teach pendants in a plexi glass box with a key on it to stop people who should not be touching pendants. I find it very odd that ABB has no means of logging off users from a teach pendant automatically.

Thanks.